State officials in West Virginia say that in most areas, they can no longer detect any of the industrial chemical MCHM that spilled into the water supply recently. They say the water is safe for people to drink and use — including most pregnant women. But other public health specialists say they don't trust these assurances.
"I think there's no way to know what the safe levels of the chemicals are at this point," says Dr. Rahul Gupta, director of the state's largest public health department. He's in charge of protecting 250,000 people whose water was affected by the spill.